Improved steam and air-whistle



Cuird 5mm @anni @time Lette/rs .Patent No. 95,981, dated October19,1869.

IMPROVED STEAM AND AIR-WHISTLE.

The Schedule referred to in these Letters Patent and making part of thylame.

To whom it may concern:

Be it known that I, THOMAS BROWN, of the city of Chicago, county ofCook, and State of Illinois, have iuvented anew and useful Improvementin Whistles to he sounded either by steam or air; and I do declare thatthe following is a true and accurate description thereof, referencebeing had to the accompanying drawings, and to the letters of referencemarked thereon, and being a part of this specification.

Figure l is a perspective view of my invention, with one end removed,showing the interior.

The nature of this invention relates to an improvement in whistles to besounded by air or steam and consists in the construction of the samewhereby a stream of air or steam issuing from the narrow openf ing of aattened pipe shall impinge against the edge of a cylindiical box,producing a sound, the quality of which may be varied as required, byincreasing or diminishing the distance between the pipe and the edge ofthe box.

In the drawings-- A is a pipe, provided at one end with a screw, forfitting it to a boiler-pipe, and flattened at the other end, so that theair or steam may issue in a narrow sheet, at B.

D 'is a cylindrical box, open at one side, and set with reference to thepipe A, so that the edge of the opening presents itself` to the streamof air or steam as it issues from the orifice at B.

This box is provided with an arm, E, by which it is attached to the pipeA, and by means of which it may be moved along the pipe, thusdiminishing or increasing the distance between the edge of the box andthe oriiice from which the air or steam issues, so varying the qualityof the sound produced.

The box D may also be constructed in one piece with the pipe A, andimmovable, and the quality of the sound varied by means of a gauge, madeot' a sheet of metal, fitted to the inside of the box, and diminishingor enlarging the opening by sliding up or down, and held in place hy ascrew fitted to a slot in the box.

The advantages of' my invention consist iu the/facility and low cost ofthe manufacture of whistles, and its adaptability to all purposes,whether of utility or amusement, for which they may be required.

What I claim as my invention, and desire to secure by Letters Patent,isc The construction of whistles with the flattened end of a pipe, andwith an opening in the side of the cylindrical box, so constructed andcombined with the pipe that the distance between the aperture from whichthe air or steam issues, and the edge upon which it strikes, may beincreased or diminished, whereby to vary the quality of the sound, allarranged as herein made known.

THOMAS BROIVN.

Vitnesses:

GEO. 0. MANCHESTER, (iHAuLns MCKAY.

